一些英语选择题,麻烦理由..1.I don't think Jim saw me;he ___into space.A.

一些英语选择题,麻烦理由..
1.I don't think Jim saw me;he ___into space.
A.just started B.was just starting C.has just started D.had just stared
2.Henry will not be able to attend the meeting tonight,because___
A.he must to teach a class
B.he will be teaching a class
C.of he will teach a class
D.he will have teaching a class
3.the price __going up all te time in the past few years
a.keep
b.kept
c.have kept
d.are
麻烦写上理由..